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The likes of Audi‘s RS 6 and the BMW M5 have taken the super sedan arms race to a near-irrational extreme. Then there are cars like the G-Power M5 Hurricane RR — the world’s fastest sedan and the atom bomb of the four-door world — that go way, way past irrational.

Because this is 800 horsepower of twin-supercharged sedan, the Hurricane will stick wheel-to-wheel with a Ferrari 458 Italia to 125 mph and then blow it off the road when things get stupid. And it’s the very same car that just stormed to a new four-door record of 231 mph — besting G-Power’s own mark, set with a lesser version of the same car.

And the best part is that without the faux carbon wrap, this Hurricane would simply recede into the sea of other cars on the road.

Sure, aficionados would likely spot the 20-inch wheels and possibly the badge, but there’s nothing else readily apparent to suggest the sheer violence underfoot. It looks like a standard-issue BMW M5 with a mild Highline bodykit, and the interior is limited to a sports steering wheel and a few splashes of carbon fiber. This is not the kind of car that roars to the heavens and spits fuel on startup, and as we pull onto the old Nordschleife, (which isn’t exactly my favorite place to test such a potentially spiky car), it’s truly relaxed. At least it is when we’re using only the first 10 percent of throttle.

It all adds up to a false sense of security. But then I drop the hammer and those wide Michelin Pilot Sport 2s start to leave a good thousand miles of life on the tarmac. When the rears finally do hook up, they simply kick the car down the road like a nuclear-powered football.

The raw figures say 62 mph falls in 4.35 seconds, which isn’t exactly supercar-fast out of the gate. Despite its weight and the sticky rubber, the Hurricane will keep spinning the rears all the way into fourth gear — in the dry. But even when fighting a losing battle for traction, this thing just flies through the 125-mph mark in 9.5 seconds and 185 mph in 25.8 seconds.

The V-10’s F1-inspired engine note now comes with the hissing whine of two superchargers in the background. This, plus the chirp of the tires on each upshift, and the closing speeds with other cars, are the only things that give away the monumental speed of this otherwise laconic monster.

It’s the kind of power that deserves and commands respect at the Nurburgring, especially running in a train of cars. Here we can only stab playfully at the throttle and feel the monumental force plowing through the drivetrain as the computers battle in vain to contain it. The whole car shimmies delicately from side to side down anything approaching a straight.

The Hurricane’s version of the M5’s V-10 is fitted with two ASA T1-316 superchargers, one for each bank of cylinders. While a 60 percent power boost sounds like a lot for the engine to take, ASA also supplies the superchargers to Alpina — another notable BMW tuner known for demanding factory levels of reliability. In addition to the superchargers, the engine has been fitted with Mahle forged pistons, new H-pattern connecting rods, and piston pins.

Surprisingly, only the crankshaft requires a thorough inspection to ensure it’s the highest grade BMW can muster. The rest of the internals are more than up to the job. G-Power boss Christian Stober is full of praise for BMW’s groundbreaking V-10 and says it is “extremely strong.”

The engine’s cooling system has been upgraded for the Hurricane and opening the engine bay reveals a cast aluminum airbox, painted in luminous orange and bolted to the superchargers with separate braces. It’s not subtle, but it’s impressive and contributes to the sheer lunacy.

Engine torque is limited to 590 pound-feet to save the SMG gearbox from shattering like expensive glass. But that’s still a massive 210-pound-foot hike over the base car. There’s power to spare from 1000 rpm and from 3000 rpm on I’m basically a passenger with a wheel in my hand.

Needless to say, the stock suspension needed work to cope with the additional power, and G-Power slotted in KW coilovers that offer nine steps of adjustability for the compression and rebound. Even the lightweight 20-inch Clubsport wheels, Pilot Sport 2 tires, and BMW’s advanced traction control aren’t enough to contain clubfoot acceleration. It will swing sideways and leave a forest fire’s worth of smoke if that’s what you want. At some point, of course, you will.

Driven with self-control, though, there’s a monumental amount of grip on offer, something I’m eternally grateful for on a circuit with no runoff and a reputation for punishing mistakes. The front end bites with that traditional M5 surety-more, in fact-and then it’s up to me not to confuse things by moderating the throttle until all the wheels are straight.

Incidentally, the world record car wore smaller 19-inch wheels and specially developed rubber from Michelin that could take the high-speed beating. There aren’t many tires in the world that can withstand 231 mph on a long-term basis, and the tire giant deserves credit for plowing resources into this relatively small project.

And then there are the brakes-a traditional M-car weak point. That’s bad enough at the supposed 155-mph cutoff point of the base M5; at 231 mph it’s potentially a big, big problem. So G-Power brought in a big solution: 15-inch Brembo rotors and six-piston calipers at the front and four-piston calipers on the rear. That’s a similar setup to the Porsche Cayenne Turbo, so rest assured they can handle the low-slung and lighter M5.

You can certainly question the logic behind the Hurricane, as anyone with the $315,000 required to buy it in the first place will no doubt have something more refined for the trip to the office and another car that’s lighter and more suited for track days. And there’s nowhere on Earth where you can actually go out and use the car’s full potential, short of a high-speed test circuit designed specifically for the 231-mph task at hand.

But to focus on that would be to willfully miss the point. The G-Power M5 Hurricane RR will sell because it can, not because it will. Because some supremely rich car nut will no doubt want to get his kicks blowing 458s and Murcielagos into the weeds, and then just as quickly melt back into the ocean of transportation around him.

2010 G-Power M5 Hurricane RR

Base price

$315,000

Vehicle layout

Front engine, RWD, 4-door sedan

Engine

5.0L/800-hp/590lb-ft Twin supercharged, DOHC, 40-valve V-10

Transmission

7-speed auto-clutch manual

Curb Weight

4050 lbs (est)

Wheelbase

113.7 in

Length x width x height

189.0 x 66.9 x 55.7

0-60mph

4.35 sec (mfr est)

EPA City/Highway

10/15 mpg (est)

On Sale

Currently

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